Oh, I have no idea but with the countless race changes and gender changes that I have done...well over 1k euros without counting the actual subs.
Oh well, I quit wow 3 days ago after my boredom level as well as well as the pvp frustration level finally reached max values.

According to my account history, which has tracked everything I've spent since Oct '06, I've given Blizzard $1,538.85.

I see it as a win/win since if I wasn't playing WoW, I'd probably have bought more games to keep me busy. Let's say another 6 games minimum a year, at 7 years, at around $65 each (including tax)... that's $2730! And that's IF I were to only buy 6 games in a YEAR. "6 games is a lot!" Oh really? How many of the average gamers do you think aren't getting or haven't already pre-ordered BF4, CoD, AC:BF, Batman, FFXV, Titanfall, Watchdogs, Destiny, ect.? And THAT'S just what's coming out in within the next few months!

4x World of Warcraft Vanilla edition
3x World of Warcraft Burning crusade edition
2x World of Warcraft Wrath of the Lich king edition
1x World of Warcraft Cataclysm edition
1x World of Warcraft Mists of pandaria edition
3x World of Warcraft battle chest

Reqruit a friend programme x4 (i paid for most of these)

1x World of Warcraft Cataclysm collectors edition
1x World of Warcraft Mists of Pandaria collectors edition

Almost $300 in games and about a year & a half in sub fees to World of Warcraft.

I never bought anything in their store such as minipets or whatever doodads they sell. And I never really liked World of Warcraft enough to buy all the expansions and sub for years at a time.

Most of the expense is buying Diablo multiple copies. Back in those D2 glory days of mutiboxing. But those used to be like $10 on Ebay and $20 on Amazon. Which you sorta broke even on at the least if you were a serious D2 power trader.